The Borderline – 警界線 | 17 Episodes

When Dou Yat Fei, an undercover cop for the past 10 years, returns to his job on the Hong Kong Police Force, he must tackle conflicting loyalties that pits his former life as a crook with his current one as a high-ranking police officer. His friend and previous partner in crime, Cheung Kwan, won’t stop until he successfully convinces him to abandon his cop identity for his “true” one as Cheung’s second-in-command. A police officer’s wrongful murder accusation and its connection to Dou and Cheung’s past may be just the tipping point that pushes Dou to finally choose if he wants to remain as the good cop or go back to his life of crime.